<!--
/**
 * author: vformAdmin
 * email: vdpadmin@163.com
 * website: https://www.vform666.com
 * date: 2021.08.18
 * remark: 如果要分发VForm源码，需在本文件顶部保留此文件头信息！！
 */
-->

<template>
  <el-container class="main-container full-height">

    <el-container>
      <el-aside class="side-panel">
        <widget-panel :designer="designer" />
      </el-aside>

      <el-container class="center-layout-container">
        <el-header class="toolbar-header">
          <toolbar-panel :designer="designer" ref="toolbarRef">
            <template v-for="(idx, slotName) in $slots" #[slotName]>
              <slot :name="slotName"></slot>
            </template>
          </toolbar-panel>
        </el-header>
        <el-main class="form-widget-main">
          <el-scrollbar class="container-scroll-bar" :style="{height: scrollerHeight}">
            <v-form-widget :designer="designer" :form-config="designer.formConfig" ref="formRef">
            </v-form-widget>
          </el-scrollbar>
        </el-main>
      </el-container>

      <el-aside>
        <setting-panel :designer="designer" :selected-widget="designer.selectedWidget" :form-config="designer.formConfig" />
      </el-aside>
    </el-container>

  </el-container>
</template>

<script>
import WidgetPanel from './widget-panel/index'
import ToolbarPanel from './toolbar-panel/index'
import SettingPanel from './setting-panel/index'
import VFormWidget from './form-widget/index'
import { createDesigner } from '@/views/lowcode/components/form-designer/designer'
import {
  addWindowResizeHandler,
  deepClone,
  getAllContainerWidgets,
  getAllFieldWidgets,
  getQueryParam, traverseAllWidgets
} from '@/views/lowcode/utils/util'
import { MOCK_CASE_URL, VARIANT_FORM_VERSION } from '@/views/lowcode/utils/config'
import i18n, { changeLocale } from '@/views/lowcode/utils/i18n'
import axios from 'axios'

export default {
  name: 'VFormDesigner',
  componentName: 'VFormDesigner',
  mixins: [i18n],
  components: {
    WidgetPanel,
    ToolbarPanel,
    SettingPanel,
    VFormWidget
  },
  props: {
    /* 后端字段列表API */
    fieldListApi: {
      type: Object,
      default: null
    },

    /* 禁止显示的组件名称数组 */
    bannedWidgets: {
      type: Array,
      default: () => []
    },

    designerConfig: {
      type: Object,
      default: () => {
        return {
          languageMenu: true, // 是否显示语言切换菜单
          externalLink: true, // 是否显示GitHub、文档等外部链接
          formTemplates: true, // 是否显示表单模板
          eventCollapse: true, // 是否显示组件事件属性折叠面板
          widgetNameReadonly: false, // 禁止修改组件名称

          clearDesignerButton: true, // 是否显示清空设计器按钮
          previewFormButton: true, // 是否显示预览表单按钮
          importJsonButton: true, // 是否显示导入JSON按钮
          exportJsonButton: true, // 是否显示导出JSON器按钮
          exportCodeButton: true, // 是否显示导出代码按钮
          generateSFCButton: true, // 是否显示生成SFC按钮
          toolbarMaxWidth: 420, // 设计器工具按钮栏最大宽度（单位像素）
          toolbarMinWidth: 300, // 设计器工具按钮栏最小宽度（单位像素）

          presetCssCode: '', // 设计器预设CSS样式代码

          resetFormJson: false // 是否在设计器初始化时将表单内容重置为空
        }
      }
    }

  },
  data () {
    return {
      vFormVersion: VARIANT_FORM_VERSION,
      curLangName: '',

      vsCodeFlag: false,
      caseName: '',
      scrollerHeight: 0,

      designer: createDesigner(this),

      fieldList: []
    }
  },
  provide () {
    return {
      serverFieldList: this.fieldList,
      getDesignerConfig: () => this.designerConfig,
      getBannedWidgets: () => this.bannedWidgets
    }
  },
  created () {
    this.vsCodeFlag = getQueryParam('vscode') == 1
    this.caseName = getQueryParam('case')
  },
  mounted () {
    this.initLocale()

    this.scrollerHeight = window.innerHeight - 56 - 36 + 'px'
    addWindowResizeHandler(() => {
      this.$nextTick(() => {
        this.scrollerHeight = window.innerHeight - 56 - 36 + 'px'
      })
    })

    this.loadCase()

    this.loadFieldListFromServer()
  },
  methods: {
    showLink (configName) {
      if (this.designerConfig[configName] === undefined) {
        return true
      }

      return !!this.designerConfig[configName]
    },

    openHome () {
      if (this.vsCodeFlag) {
        // const msgObj = {
        //   cmd: 'openUrl',
        //   data: {
        //     url: 'https://www.vform666.com/'
        //   }
        // }
        // window.parent.postMessage(msgObj, '*')
      }
    },

    openUrl (event, url) {
      if (this.vsCodeFlag) {
        // const msgObj = {
        //   cmd: 'openUrl',
        //   data: {
        //     url
        //   }
        // }
        // window.parent.postMessage(msgObj, '*')
      } else {
        let aDom = event.currentTarget
        aDom.href = url
        // window.open(url, '_blank') //直接打开新窗口，会被浏览器拦截
      }
    },

    loadCase () {
      if (!this.caseName) {
        return
      }

      axios.get(MOCK_CASE_URL + this.caseName + '.txt').then(res => {
        if (res.data.code) {
          this.$message.error(this.i18nt('designer.hint.sampleLoadedFail'))
          return
        }

        this.setFormJson(res.data)
        this.$message.success(this.i18nt('designer.hint.sampleLoadedSuccess'))
      }).catch(error => {
        this.$message.error(this.i18nt('designer.hint.sampleLoadedFail') + ':' + error)
      })
    },

    initLocale () {
      let curLocale = localStorage.getItem('v_form_locale')
      if (this.vsCodeFlag) {
        curLocale = curLocale || 'en-US'
      } else {
        curLocale = curLocale || 'zh-CN'
      }
      this.curLangName = this.i18nt('application.' + curLocale)
      this.changeLanguage(curLocale)
    },

    loadFieldListFromServer () {
      if (!this.fieldListApi) {
        return
      }

      let headers = this.fieldListApi.headers || {}
      axios.get(this.fieldListApi.URL, { 'headers': headers }).then(res => {
        let labelKey = this.fieldListApi.labelKey || 'label'
        let nameKey = this.fieldListApi.nameKey || 'name'

        this.fieldList.splice(0, this.fieldList.length) // 清空已有
        res.data.forEach(fieldItem => {
          this.fieldList.push({
            label: fieldItem[labelKey],
            name: fieldItem[nameKey]
          })
        })
      }).catch(error => {
        this.$message.error(error)
      })
    },

    handleLanguageChanged (command) {
      this.changeLanguage(command)
      this.curLangName = this.i18nt('application.' + command)
    },

    changeLanguage (langName) {
      changeLocale(langName)
    },

    setFormJson (formJson) {
      let modifiedFlag = false
      if (formJson) {
        if (typeof formJson === 'string') {
          modifiedFlag = this.designer.loadFormJson(JSON.parse(formJson))
        } else if (formJson.constructor === Object) {
          modifiedFlag = this.designer.loadFormJson(formJson)
        }

        if (modifiedFlag) {
          this.designer.emitHistoryChange()
        }
      }
    },

    getFormJson () {
      return {
        widgetList: deepClone(this.designer.widgetList),
        formConfig: deepClone(this.designer.formConfig)
      }
    },

    clearDesigner () {
      this.$refs.toolbarRef.clearFormWidget()
    },

    /**
       * 刷新表单设计器
       */
    refreshDesigner () {
      // this.designer.loadFormJson( this.getFormJson() )  //只有第一次调用生效？？

      let fJson = this.getFormJson()
      this.designer.clearDesigner(true) // 不触发历史记录变更
      this.designer.loadFormJson(fJson)
    },

    /**
       * 预览表单
       */
    previewForm () {
      this.$refs.toolbarRef.previewForm()
    },

    /**
       * 导入表单JSON
       */
    importJson () {
      this.$refs.toolbarRef.importJson()
    },

    /**
       * 导出表单JSON
       */
    exportJson () {
      this.$refs.toolbarRef.exportJson()
    },

    /**
       * 导出Vue/HTML代码
       */
    exportCode () {
      this.$refs.toolbarRef.exportCode()
    },

    /**
       * 生成SFC代码
       */
    generateSFC () {
      this.$refs.toolbarRef.generateSFC()
    },

    /**
       * 获取所有字段组件
       * @returns {*[]}
       */
    getFieldWidgets (widgetList = null) {
      return widgetList ? getAllFieldWidgets(widgetList) : getAllFieldWidgets(this.designer.widgetList)
    },

    /**
       * 获取所有容器组件
       * @returns {*[]}
       */
    getContainerWidgets (widgetList = null) {
      return widgetList ? getAllContainerWidgets(widgetList) : getAllContainerWidgets(this.designer.widgetList)
    },

    /**
       * 升级表单json，以补充最新的组件属性
       * @param formJson
       */
    upgradeFormJson (formJson) {
      if (!formJson.widgetList || !formJson.formConfig) {
        this.$message.error('Invalid form json!')
        return
      }

      traverseAllWidgets(formJson.widgetList, (w) => {
        this.designer.upgradeWidgetConfig(w)
      })
      this.designer.upgradeFormConfig(formJson.formConfig)

      return formJson
    },

    getWidgetRef (widgetName, showError = false) {
      return this.$refs['formRef'].getWidgetRef(widgetName, showError)
    },

    getSelectedWidgetRef () {
      return this.$refs['formRef'].getSelectedWidgetRef()
    }

    // TODO: 增加更多方法！！

  }
}
</script>

<style lang="scss" scoped>
  .el-container.main-container {
    //background: #fff;

    ::v-deep aside {  /* 防止aside样式被外部样式覆盖！！ */
      margin: 0;
      padding: 0;
      background: inherit;
    }
  }

  .el-container.full-height {
    height: 100%;
    overflow-y: hidden;
  }

  .el-container.center-layout-container {
    min-width: 680px;
    border-left: 2px dotted #EBEEF5;
    border-right: 2px dotted #EBEEF5;
  }

  .el-header.main-header {
    border-bottom: 2px dotted #EBEEF5;
    height: 48px !important;
    line-height: 48px !important;
    min-width: 800px;
  }

  div.main-title {
    font-size: 18px;
    color: #242424;
    display: flex;
    align-items: center;
    justify-items: center;

    img {
      cursor: pointer;
      width: 36px;
      height: 36px;
    }

    span.bold {
      font-size: 20px;
      font-weight: bold;
      margin: 0 6px 0 6px;
    }

    span.version-span {
      font-size: 14px;
      color: #101F1C;
      margin-left: 6px;
    }
  }

  .float-left {
    float: left;
  }

  .float-right {
    float: right;
  }

  .el-dropdown-link {
    margin-right: 12px;
    cursor: pointer;
  }

  div.external-link a {
    font-size: 13px;
    text-decoration: none;
    margin-right: 10px;
    color: #606266;
  }

  .el-header.toolbar-header {
    font-size: 14px;
    border-bottom: 1px dotted #CCCCCC;
    height: 42px !important;
    //line-height: 42px !important;
  }

  .el-aside.side-panel {
    width: 260px !important;
    overflow-y: hidden;
  }

  .el-main.form-widget-main {
    padding: 0;

    position: relative;
    overflow-x: hidden;
  }

  .container-scroll-bar {
    ::v-deep .el-scrollbar__wrap, ::v-deep .el-scrollbar__view {
      overflow-x: hidden;
    }
  }
</style>
